Well look up reviews man. Tom's Hardware is great. Asus makes some of the most reliable boards out there. But if you want insane overclocking options DFI is the way to go. If you're just looking to do normal/advanced overclocking the Asus is fine.

When it comes down to it they'll both overclock to just about the same speeds. It's just a matter of which one will last the longest.. I'd gamble on an Asus.